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【单选题】
25 °C 时,将浓度均为 0.1mol · L -1 ,体积分别为 Va 和 Vb 的 HA 溶液与 BOH 溶液按不同体积比混合,且保持 Va+Vb=100mL , Va 、 Vb 与混合液的 pH 的关系如图所示 .下列说法正确的是A.
Ka(HA) ≈ 1 × 10 -6
B.
c 点时， 随温度升高而增大
C.
a → c 过程中水的电离程度始终增大
D.
b 点时， c(B + )=c(A - )
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【单选题】用EDTA连续滴定Fe3+,A13+时,可在( )。
A.
pH=2滴定Al³+，pH=4滴定Fe³+
B.
pH=1滴定Fe³+，pH=4滴定Al³+
C.
pH=2滴定Fe³+，pH=4返滴定Al³+
D.
pH=2滴定Fe³+，pH=4间接法测Al³+
【单选题】王国维在《人间词话》中说古今成大事者都必经历三种境界,其中“衣带渐宽终不悔,为伊消得人憔悴”取自( )
A.
晏殊的蝶恋花
B.
柳永的蝶恋花
C.
欧阳修的蝶恋花
D.
李清照的蝶恋花
【简答题】课前实践作业: 请同学们运用瓦楞纸、图钉、胶水、剪刀,参考视频资源完成四杆机构原理模型制作,并上传 制作心得。
【简答题】Speaking and Writing in the University: A Multi-dimensional Comparison (1) The dozens of studies on academic discourse carried out over the past 20 years have mostly focused on written academic prose ...
【简答题】阅读理解。 根据短文内容，从下框的A-F选项中选出能概括每一段主题的最佳选项。选项中有一项 为多余项。 A.The secret of the writer's success B. A write with e nduring popularity C. Well-received creation toencourage Brits D. The insight into human natu...
【简答题】On November 19, 2010, Harry Potter and the Deathly Hallows: Part I was released in many countries at the same time! This is another Harry Potter film. The idea for the book Harry Potter and the Philos...
【简答题】听下面一段材料，回答第1至3题。 1. What was the won doing last month? A. Se was taking care of her sick mother. B. She was writing a novel. C. She was taking care of her father while she was writing a novel. 2. How ...
【单选题】The writer her children so that she could concentrate on her writing, because they are too noisy．
A.
sent out
B.
sent for
C.
send up
D.
send away
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